DAP Dynaflex Ultra Advanced Sealant for window, door, siding and trim applications is formulated with innovative Weather Max technology to resist UV fading, chalking, crumbling, cracking and dirt buildup. It also has a lifetime mold and algae resistance guarantee, so the sealant stays clean and new. Dynaflex Ultra has strong adhesion to common building materials and remains permanently flexible for a durable, weather-resistant seal that provides all-weather protection and resists the elements. It is rain-ready and can be painted in just one hour for better productivity. It doesn't bubble. Sealant assembles effortlessly and tools hassle-free for easy application